The supernova-regulated ISM - VI. Magnetic effects on the structure of the interstellar medium

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openAccess

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Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2019-10

Major/Subject

Mcode

Degree programme

Language

en

Pages

10
5065-5074

Series

Monthly Notices of the Royal Astronomical Society, Volume 488, issue 4

Abstract

We explore the effect of magnetic fields on the vertical distribution and multiphase structure of the supernova-driven interstellar medium in simulations that admit dynamo action. As the magnetic field is amplified to become dynamically significant, gas becomes cooler and its distribution in the disc becomes more homogeneous. We attribute this to magnetic quenching of vertical velocity, which leads to a decrease in the cooling length of hot gas. A non-monotonic vertical distribution of the large-scale magnetic field strength, with the maximum at |z| approximate to 300pc causes a downward pressure gradient below the maximum which acts against outflow driven by SN explosions, while it provides pressure support above the maximum.

Description

| openaire: EC/H2020/228398/EU//HPC-EUROPA2

Keywords

MHD, turbulence, ISM: evolution, galaxies: kinematics and dynamics, galaxies: magnetic fields, COSMIC-RAY, HYDROSTATIC EQUILIBRIUM, TURBULENT MODEL, 3-DIMENSIONAL EVOLUTION, DYNAMICAL EVOLUTION, DIRECT SIMULATIONS, GALACTIC WINDS, STAR-FORMATION, GLOBAL-MODELS, DRIVEN, 113 Computer and information sciences

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Citation

Evirgen , C C , Gent , F A , Shukurov , A , Fletcher , A & Bushby , P J 2019 , ' The supernova-regulated ISM - VI. Magnetic effects on the structure of the interstellar medium ' Monthly Notices of the Royal Astronomical Society , vol. 488 , no. 4 , pp. 5065-5074 . https://doi.org/10.1093/mnras/stz2084